Piston assembly



Oct. 192s.

R. J. SHEIRING ET AL PISTON ASSEMBLY Filed March 24, 1924 Patented Oct.5, 192,6.

UNITED STATES PATENT OFFICE.

RALPH J'. SHEIBING AND JOHN E. SLOAN, .OF DETROIT, MICHIGAN.

rrs'roN ASSEMBLY.

Application 1ed March 24, 1924. Serial No. 701,573.

The invention relates to piston assemblies and has for one of itsobjects the provision .of a piston and connecting rod which may bedisconnected from each otherwhen the 5 piston is located within thecylinder and from the outer end of the cylinder. Another object is theprovision of an improved form of piston ring. With these. as well asother objects in view, the invention resides in the novel features ofconstruction and combinations and arrangements of parts as nore fullyhereinafter set forth.

In the drawings:

Figure 1 is a top plan viewof a piston assembly embodying our invention;

Figure 2 is a vertical transverse therethrough.

1 is the skirt of the piston and 2 is the head. 3 is the connecting rodhaving at its upper end the removable bearing cap 4 which is adapted tobe clamped to the lower section half-bearing 5 by suitable means such asthe bolts 6. 7 is the wrist pin clamped between the lower half-bearing 5and the upper bearing cap 4 and journalled in the bushings 8 fixed inthe bosses 9 of the skirt 1.

The head 2 of the piston is removable from the skirt, and as shown has athreaded engagement therewith and is providedwith suitable means such asthe recesses 10 in its upper face for engagement in by a tool to detachthe head from the skirt, while the piston is still located within thecylinder, this operation being carried out from the outer end of thecylinder. Also, we have provided a suitable lock forholding the headfrom rotating relative to the skirt, this lock preferably comprising ascrew 11 engaging the threads ofthehead and skirt.

With this arrangement it will be seen that with the piston in the.cylinder the head 2 may be removed from the skirt, thereby p rovidingaccess to the cap bolts 6 securing the bearing cap 4 to the half-bearing5 of thereonnecting rod so that these bolts may be removed, after which.the bearing cap can'be removed and the piston -lifted up wardly out ofthe cylinder.

Another feature of our invention resides "`in forming in the outer wallof theiskirt 1 the annular V-shaped groove 12 and in pro` viding thecontinuous V-shaped piston ring 13 lin this groove. This piston ring ispreferably formed of a copper alloy, While the from passing downwardlybetween the pisto'n and cylinder wall. This piston ring is preferablycast upon the piston skirt, and since the melting points of the twomateiials are very different liability of fusing is avoided.

v With this arrangement, an under-sized piston maybe used Withoutaffecting the efficiency of the engine inasmuch as the piston ring eastthereon has an outer diameter to slidably lit within the cylinder andinL asmuch as this ring has an extended bearing surface owing to itsrelatively great width.

lVhat we claim as our invention is:

1. The lcombination with a piston having an integral skirt portion withan annular' V-shaped groove therein, of a continuous piston ring in saidgroove and formed of a material having a higher co-eiiicient of eX-pansion than that of which said skirt portion is formed.

2. The combination with a piston having an integral skirt portion, anannular' groove in the upper end thereof, of a continuous piston ringengaging in said groove, said piston ring being formed of a materialhav.

ing a higherco-eficient of expansion than the material of which saidpiston skirt is formed.

3. The combination with a'piston having an integral skirt portion withan annular V-shaped groove therein, of an endless piston ring in saidgroove and formed of a material havinga higher co-eiicient of expansionthan that of which said skirt portion is formed. v

In testimony whereof we affix our signatures.

RALPH J. SHEIRING. JOHN E. sLoAN.

